Test 2

Question 1

what scale atom is measured in

Answer 1

measured in picometers 10^-12

Question 2

subatomic particles that comprise the atom

Answer 2

protons, electrons, neutrons

• nucleus: p+ and n^o
• empty space around nucleus(cloud): e-

Question 3

protons

Answer 3

p+
positive charge (opposite to e-)
relative mass= 1 amu(atomic mass unit)

Question 4

electrons

Answer 4

e-
negative charge (opposite to p+)
relative mass= 0 amu

Question 5

neutrons

Answer 5

n^o
neutral charge
relative mass=1 amu

Question 6

Define what an isotope is

Answer 6

atoms of the same element that have the same number of protons&atomic #, but a different mass numbers (neutrons.)

Question 7

two factors used to identify an isotope

Answer 7

Mass number compared to atomic number

Question 8

-Define mass number
-Understand why an isotope’s mass number is not exactly the same, but close
to the same isotope’s atomic mass

Answer 8

Sum of Protons and neutrons

Ps and Ns are not exactly 1 amu

Question 9

the names of the two different isotope notations

Answer 9

Hyphen notation vs nuclear notation

Question 10

average atomic mass

Answer 10

average mass of all isotopes of an element(depending on their natural abundance)-average atomic mass appears on periodic table